Just about every streaming music app has an option to share whatever you're listening to. However, using that feature on your phone can be a pain -- by the time you've reached into your pocket and crafted that social post, the moment might already be over. Muzik thinks it can help. For a while now, it's been developing smart headphones whose smart keys let you perform numerous tasks just by tapping keys on an ear cup, including sharing to social networks. If you just had a musical epiphany, you can let the world know on Twitter or Facebook. In fact, Twitter loves it so much that it decided to make the company its first ever hardware investment.